Picture postcard icon for a display screen



FIG. 1 is a front view of a "picture postcard" icon for a display screen according to the present invention, the broken line drawing of a display screen is for illustrative purposes only and forms no part of the claimed design; and,

FIG. 2 is a front view thereof, on an enlarged scale, the "picture postcard" icon is shown separately for clarity of illustration. 

The ornamental design for a picture postcard icon for a display screen, as shown and described. 